Brake shoe



R. B. POGUE May 9, 1933.

BRAKE SHOE FiledMay 31, 1930 Patented May 9, 1933 UNITED siumlrzs PATENTOFFICE ROBERT IB. TOQUE, or CHICAGO, ILLINOIS, AssIGNoR-To TianyAMERICANBRAKE siren? AND FOUNDRY COMPANY, or WILMINGTON. DELAWARE, ACORPORATION OF niinA-Vv WARE ` BRAKE SHOE' Application lcd May 31,

This invention relates to brake shoes and more particularly to commoncast iron shoes which are provided with reenforce backs and may beprovided with inserts in the Wearing face.

The object of the invention is to increase the body metal at the sidesof the attaching lug thereby giving this portion of the cast iron bodygreater strength and resistance to the conditions met with in service.

I have shown the invention in a car shoe having a ductile metal backcommonly called a steel back and with a solid cast iron body, andreferring thereto.

Fig. 1 is a top plan view showing the back and lug strap in fulllinesand the body and the cast iron parts of the shoe in broken lines.

Fig. 2 is a side elevation of Fig. 1.

Fig. 3 is a section on the line 8-3 of Fig. 1 showing the back in fulllines and the lug strap in broken lines.

Fig. 4 is a section of the back on the line 4-1 of Fig. 1.

Fig. 5 is a section on the line 5 5 of Fig.

2 showing all the parts in full lines.

Fig. 6 is a section on the line 6 6 of Fig. V.2 showing all the parts infull lines.

Referring to the drawing 7 is the body, 8 is the ductile metal back and9 is the lug strap.

The back and the lug strap are assembled` as indicated and placed in amold, and then the molten cast iron is poured into the mold and Venibedsthe back and lug strap therein. The cast iron forms the body, the endlugs 10, the end guides 11 and the projections 12 at the sides of thelug strap 9.

I provide the enlargements 13 at the upper portion of the body oppositethe ends of the back so that there will be as much or sub- 0 stantiallyas much body metal beyond the ends of the back as there has beenheretofore, and notwithstanding the lengthening of the back toV extendunder the end lugs.

AIn the construction shown the enlargements taper toward the face of theshoe and the 1930..` S-eiiiiall iN. 457,814.

wearing face is no longer than it has been heretofore; and theenlargements taper toward the end lugs and add to the strength thereof.I also prefer to provide the ends of the back beneath the end lugs withopenings J 14 to receive the cast iron for more securely anchoring theend lugs and guide lugs to the body and to the back. It has been thepractice to run the body metal up at the sides of the lug strap to formwith the strap the attaching lug of the shoe. The outer faces of theseprojections have constituted in eect jections will extend beyond theplanes of the sides of the body. These enlargements eX- tend somewhatforward of the reenforce back and form shoulders which may be employedto indicate the limit of Wear of the body of the shoe. This lenlargementof the projections 12 increases the strength of the projections and theattaching lug as a Whole and enables it to withstand the serviceconditions to which it is subjected.` The enlargement of the projections12 at 16 increases the crosssectional area of the cast iron lugreenforcement, which contacts With the brake head and thereby decreasesthe wear on the brake head in proportion to the increasedcross-sectional area of contact. This is accomplished with-V outchanging the method of manufacture. The enlargements at the outer facesof the projections at the sides of the lug strap have the effect ofincreasing the strength of these projections thereby affording greaterprotection for the strap while at the same time Y asf the projectionsfunction with the strap in the Y same manner as before in forming theattaching lug. f

I do not restrict the invention to the particular embodiment illustratedin the drawing but propose to employ it nany shoe for which it is or maybe adapted and I reserve the right to make all changes in the form,construction and arrangement of parts Within the scope of the followingclaim.

I claim:

A brake shoe comprising a body, a reenforce back embedded in the body atthe back thereof, a lug strap engaged With the reenforce back, andprojections from the body lextending above the back of the body at thesides of the lug strap to form therewith an attaching lug, saidlprojections being enlarged laterally of the shoe andrextending beyondthe sides of the body to increase the cross-Sectional area of theattaching lug and reduce Wear on the brake head.

ROBERT B. POGUE.

